Help understanding balloon pilot

Hello

Trying to wrap your head around the Vmware balloon pilot. I think I understand, but hoping someone here can confirm or put me in the right direction. We had a problem of performance recently, which turned out be a storage problem, but the use of memory on our guests have caught my attention.

We have a cluster with eight (8) ESXi 4.0 U2 guest - dual Xeon 6 core procs with 72 GB of memory each. 32 Win 2 k 3 customers spread evenly between hosts (4) each configured to use 20GB memory, but on average only use 15-17GB. No reserve on the set of CPU or memory. Standards equal overall of all guests. Use of memory on the host computers are consistenly below the physical memory on the server.

Once turned on the consistenly guests have 15-17 GB of memory that are assigned, even if on operating times more low Windows reports only by using 2.5 GB of memory. During periods of use lowest Vmware brings about active memory 1 GB, but 15-17 GB is always attributed to each guest.

Now, my understanding of the pilot balloon is that until there are conflicts of resources, it calls, which is why we are seeing only the 15-17 GB of memory always allocated for the guests and it never goes down - because we never run out of physical resources. If I run performace reports/charts, the ball of memory always show 0 on all the guests.

I understand the balloon pilot? Given the configuration, are allocations of memory of guests act properly. And could / should I think of other ways to optimize performance in the environment?

Thanks in advance.

-Adam

I think you have a good understanding of the use of scenarios for the balloon pilot.  For me, your environment seems to be installed, at least from a perspective of resources VM, much like ours.  We didn't put no limit and not to use any resources, other than the DRS pools.

Tags: VMware

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